In this thesis, I developed on the notion of relational repair between close allies after a serious dispute. I focused particularly on the ways in which close allies, such as members of the Atlantic alliance, can or cannot make a high degree of relational repair possible between them at the end of such disputes. My conclusions state that relational repair can become possible to a high degree between close allies after a serious dispute only if the injuring act, that is, the action that had led to a perception of injury from the offended party, and so to the dispute, is undone. If it is not the case, relational repair may be possible between the countries concerned at the end of the dispute, but to a much lower degree, making the relational repair process afterwards longer and more difficult